dFactory

<a href="http://www.dfactory.co/products/download-attachments/" rel="nofollow ugc">Download Attachments</a> is a new approach to managing downloads in WordPress. Instead of bloated interface it enables simple, drag & drop and AJAX driven metabox where you can insert and manage your Media Library files and automatically or manually display them after, before or inside posts content.
For more information, check out plugin page at <a href="http://www.dfactory.co/" rel="nofollow ugc">dFactory</a> site.
<h4>Features include:</h4>
<ul>
<li>Automatic or manual download links display</li>
<li>Select post types where Download Attachments should be used</li>
<li>Select list, table or sortable, dynamic table display style</li>
<li>Downloads count</li>
<li>Advanced attachments sorting</li>
<li>Most Downloaded Attachments widget</li>
<li>Drag & drop files ordering</li>
<li>Based on Media Library attachments</li>
<li>Easy customisation of Frontend & Backend display</li>
<li>Pretty URLs for download links</li>
<li>Encrypt URLs by default</li>
<li>Customizable tamplates engine</li>
<li>Custom download slug</li>
<li>Custom permission for metabox display</li>
<li>Option to exclude selected attachments from display</li>
<li>Option to select from all Media Library files or only those attached to a post</li>
<li>2 shortcodes</li>
<li>5 functions and multiple filter hooks for developers</li>
<li>Option to use attachment caption and/or description for download links description</li>
<li>Compatible with WPML & Polylang</li>
<li>.pot file for translations included</li>
</ul>
<h4>Get involved</h4>
Feel free to contribute to the source code on the <a href="https://github.com/dfactoryplugins" rel="nofollow ugc">dFactory GitHub Repository</a>.

Download Attachments

Download Attachments is a new approach to managing downloads in WordPress. It allows you to easily add and display download links in any post or page.

Jason Coleman

Adds a short code like [download file=”path_to_file”] that embeds a form in the post asking for an email address before showing a link to a file for download. Great for promoting white papers and other digital assets on your site.
Live demo: http://www.strangerstudios.com/blog/2010/07/ss-downloads-wordpress-plugin/
The plugin works in 3 parts.
<ol>
<li>
The short code to add the form to your pages.
</li>
<li>
The logic to check (using session variables) if the user has provided an email address before showing either the email capture form or the download link.
</li>
<li>
A script to serve files securely. It checks for the same session variable before delivering the file. Files can be located outside the web directory or servered from the uploads folder, etc, with an obfuscated URL.
</li>
</ol>
The look of the email and download forms can be changed by copying files from the /css/ and /templates/ folder of the plugin into your active theme folder. Rename the files ssd-original_file_name.php/css (e.g. ssd-download.php or ssd-ss-downloads.css) and edit as needed.

SS Downloads

Embed forms in your pages and posts that accept an email address in exchange for a file download.

Download Attachments vs SS Downloads